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Old 09-25-2014, 08:52 AM   #1
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Two roof power vents - TOO MUCH ?


My elder neighbor really needs some advice from the experts. A local roofing company installed a new roof power vent and also repaired the old roof power vent.

The problem is: The two power vents are about 4 feet apart.

It seems to me if one of the vents is not running then the running vent will pull the air from the vent not running rather than working efficiently to remove the unwanted hot/humid air in the attic.

Would you suggest one of the vents (probably the one with only a temperature sensor) not be used and plug up the hole to force the stronger vent remove the hot/humid air?

I can send you a picture of the roof showing the two vents if this will help you with your decision. She is just so upset with the way this was done and I am trying to help her.

Any assistance will be greatly appreciated.

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Old 09-25-2014, 09:19 AM   #2
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Two roof power vents - TOO MUCH ?


I think the problem isn't anything to worry over or get upset.
Fan venting is not a complicated. It is forced venting, and as long as there is enough make up air, it will work upside down and side ways. Check the CFM of the new fan and the old fan. Then search the web or the manual for opening size where the make up air should come in.
If the make up air is from indoors, worry may come from forcing the water heater or boiler from back drafting.

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Old 09-25-2014, 09:19 AM   #3
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Two roof power vents - TOO MUCH ?


Need that picture.
Makes 0 since to have them that close.
Seems like that would short circuit the whole air flow principle sucking make up air through the other vent, not the soffits.
Not a big fan of power vents in the first place.
In most cases I would have removed it and installed a ridge vent instead.
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Old 09-25-2014, 09:26 AM   #4
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Two roof power vents - TOO MUCH ?


Quote:
Originally Posted by joecaption View Post
Need that picture.
Makes 0 since to have them that close.
Seems like that would short circuit the whole air flow principle sucking make up air through the other vent, not the soffits.
Not a big fan of power vents in the first place.
In most cases I would have removed it and installed a ridge vent instead.
No picture is needed. It will not pull air from the other vents, unless these are the only two vents in the attic space. Just more description of what other kind of venting this attic has.
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Old 09-25-2014, 10:00 AM   #5
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Two roof power vents - TOO MUCH ?


It may work, but it is certainly not best practice.

Air will take the path of least resistance and if one power vent kicks on it will certainly draw a measured amount of air from the other power vent and therefore lessen the draw from the soffits and/or gable end.
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